Add iso datetime create with time zone support

The time zone check is for short mappings is limited, it is recommended
to use full TZ names like "Europe/Berlin", "Asia/Tokyo", "America/New_York"

src/corelibs/logging_handling/log.py

@@ -598,7 +598,7 @@ class Log(LogParent):
             # log path, remove them stem (".log"), then add the datetime and add .log again
             now = datetime.now()
             # we add microseconds part to get milli seconds
-            new_stem=f"{log_path.stem}.{now.strftime('%Y-%m-%d_%H-%M-%S')}.{str(now.microsecond)[:3]}"
+            new_stem = f"{log_path.stem}.{now.strftime('%Y-%m-%d_%H-%M-%S')}.{str(now.microsecond)[:3]}"
             file_handler = logging.FileHandler(
                 filename=log_path.with_name(f"{new_stem}{log_path.suffix}"),
                 encoding="utf-8",

src/corelibs/string_handling/datetime_helpers.py

@@ -3,7 +3,9 @@ Various string based date/time helpers
 """
 
 from math import floor
-import time
+import time as time_t
+from datetime import datetime
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 
 def convert_timestamp(timestamp: float | int, show_micro: bool = True) -> str:
@@ -58,6 +60,77 @@ def create_time(timestamp: float, timestamp_format: str = "%Y-%m-%d %H:%M:%S") -
     Returns:
         str -- _description_
     """
-    return time.strftime(timestamp_format, time.localtime(timestamp))
+    return time_t.strftime(timestamp_format, time_t.localtime(timestamp))
+
+
+def get_system_timezone():
+    """Get system timezone using datetime's automatic detection"""
+    # Get current time with system timezone
+    local_time = datetime.now().astimezone()
+
+    # Extract timezone info
+    system_tz = local_time.tzinfo
+    timezone_name = str(system_tz)
+
+    return system_tz, timezone_name
+
+
+def parse_timezone_data(timezone_tz: str = '') -> ZoneInfo:
+    """
+    parses a string to get the ZoneInfo
+    If not set or not valid gets local time,
+    if that is not possible get UTC
+
+    Keyword Arguments:
+        timezone_tz {str} -- _description_ (default: {''})
+
+    Returns:
+        ZoneInfo -- _description_
+    """
+    try:
+        return ZoneInfo(timezone_tz)
+    except (ZoneInfoNotFoundError, ValueError, TypeError):
+        # use default
+        time_tz, time_tz_str = get_system_timezone()
+        if time_tz is None:
+            return ZoneInfo('UTC')
+        # TODO build proper TZ lookup
+        tz_mapping = {
+            'JST': 'Asia/Tokyo',
+            'KST': 'Asia/Seoul',
+            'IST': 'Asia/Kolkata',
+            'CST': 'Asia/Shanghai',  # Default to China for CST
+            'AEST': 'Australia/Sydney',
+            'AWST': 'Australia/Perth',
+            'EST': 'America/New_York',
+            'EDT': 'America/New_York',
+            'CDT': 'America/Chicago',
+            'MST': 'America/Denver',
+            'MDT': 'America/Denver',
+            'PST': 'America/Los_Angeles',
+            'PDT': 'America/Los_Angeles',
+            'GMT': 'UTC',
+            'UTC': 'UTC',
+            'CET': 'Europe/Berlin',
+            'CEST': 'Europe/Berlin',
+            'BST': 'Europe/London',
+        }
+        try:
+            return ZoneInfo(tz_mapping[time_tz_str])
+        except (ZoneInfoNotFoundError, IndexError) as e:
+            raise ValueError(f"No mapping for {time_tz_str}: {e}") from e
+
+
+def get_datetime_iso8601(timezone_tz: str | ZoneInfo = '', sep: str = 'T', timespec: str = 'microseconds') -> str:
+    """
+    set a datetime in the iso8601 format with microseconds
+
+    Returns:
+        str -- _description_
+    """
+    # parse if this is a string
+    if isinstance(timezone_tz, str):
+        timezone_tz = parse_timezone_data(timezone_tz)
+    return datetime.now(timezone_tz).isoformat(sep=sep, timespec=timespec)
 
 # __END__